Step-by-step explanation:
By using Ms Excel you should do this problem.
Kindly check the attachment for solution and cell reference for the clear understanding.
The answer is 139 cubic yards
This mulch will be of cylindrical shape.
The volume (V) of a cylinder is:
V = l · w · h (l - length, w - width, h - height (in our example, height = depth)
It is known:
l = 125 feet
w = 60 feet
h = 6 inches = 0.5 feet
V = l · w · h = 125 · 60 · 0.5 = 3750 feet³
Since 1 cubic foot is 0.037 cubic yards, 3750 cubic feet are 139 cubic yards:
0.037 · 3750 feet³ = 138.75 cubic yards ≈ 139 cubic yards